What is Japanese multiplication? Although it looks a little bit like a magic trick, and in some way it is, this method is all about substituting numbers for lines.

TikTok users say their mind has been blown by a maths hack that allows them to multiply any number by 11 in a jiffy. The '11s trick' has gone viral online ...

To multiply 237 by 24 without using a calculator, you can set it out like this: The first line of the calculation is the same procedure as multiplying with a single digit number.